feat: task file manage (#196)

1. support view task file list
2. support share file on android and iOS

ui/flutter/lib/app/modules/task/views/task_files_view.dart

@@ -0,0 +1,92 @@
+import 'package:flutter/material.dart';
+import 'package:get/get.dart';
+import 'package:share_plus/share_plus.dart';
+
+import '../../../../util/file_icon.dart';
+import '../../../../util/icons.dart';
+import '../../../../util/util.dart';
+import '../../../views/breadcrumb_view.dart';
+import '../controllers/task_files_controller.dart';
+
+class TaskFilesView extends GetView<TaskFilesController> {
+  const TaskFilesView({Key? key}) : super(key: key);
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+        appBar: AppBar(
+          leading: IconButton(
+              icon: const Icon(Icons.arrow_back),
+              onPressed: () => Get.rootDelegate.popRoute()),
+          // actions: [],
+          title: Obx(() => Text(controller.task.value?.meta.res.name ?? "")),
+        ),
+        body: Obx(() {
+          final fileList = controller.fileList;
+          final breadcrumbItems = ["/"];
+          if (fileList.isNotEmpty) {
+            final file = fileList.first;
+            final path = file.path.substring(1);
+            if (path.isNotEmpty) {
+              final pathArr = path.split("/");
+              for (int i = 0; i < pathArr.length; i++) {
+                breadcrumbItems.add(pathArr[i]);
+              }
+            }
+          }
+          return Column(
+            children: [
+              Breadcrumb(
+                  items: breadcrumbItems,
+                  onItemTap: (index) {
+                    final targetDirArr = <String>[];
+                    for (int i = 0; i <= index; i++) {
+                      targetDirArr.add(breadcrumbItems[i]);
+                    }
+                    controller
+                        .toDir(targetDirArr.join("/").replaceFirst('//', '/'));
+                  }).paddingOnly(left: 16, top: 16, bottom: 8),
+              Expanded(
+                child: ListView.builder(
+                  itemBuilder: (context, index) {
+                    final meta = controller.task.value!.meta;
+                    final file = fileList[index];
+                    return ListTile(
+                      leading: file.isDirectory
+                          ? const Icon(Icons.folder)
+                          : Icon(FaIcons.allIcons[findIcon(file.name)]),
+                      title: Text(fileList[index].name),
+                      subtitle: file.isDirectory
+                          ? Text('items'.trParams({
+                              'count': controller
+                                  .dirItemCount(file.fullPath)
+                                  .toString()
+                            }))
+                          : Text(Util.fmtByte(file.size)),
+                      trailing: file.isDirectory
+                          ? null
+                          : IconButton(
+                              icon: const Icon(Icons.share),
+                              onPressed: () {
+                                final xfile = XFile(Util.safePathJoin([
+                                  meta.opts.path,
+                                  meta.res.rootDir,
+                                  file.fullPath
+                                ]));
+                                Share.shareXFiles([xfile]);
+                              }),
+                      onTap: () {
+                        if (file.isDirectory) {
+                          controller.toDir(file.fullPath);
+                        }
+                      },
+                    );
+                  },
+                  itemCount: controller.fileList.length,
+                ),
+              )
+            ],
+          );
+        }));
+  }
+}